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Aragonite

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Aragonite has the same chemical make up as calcite, calcium carbonate CaCO3.  Aragonite is a polymorph of calcite, meaning it has the same chemical formula but with a different  crystal structure. Common crystal forms are columnar, botryoidal, fiberous, and branching. Like calcite it is a very soft mineral, In its purest form it is translucent or white but can be most any color depending on traces of other minerals.
Marine animals use aragonite to make their shells. It is found all over the world.

Mineral Properties of Aragonite

Chemical formula: Calcium Carbonate CaCO 3
Color(s): Typically colorless but it can be many different colors
Streak: White
Luster: Vitreous to dull
Transparency: Transparent to opaque
Crystal system: Orthorhombic
Specific Gravity: 2.9-3
Hardness (Mohs): 3.5-4
Cleavage: poor cleavage
Fracture: subconchoidal
Uses: used by many different animals to make shells
Location: Common in many places world wide
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